过渡金属的通用表面工程用于中性水中的高级电催化演变
Bo You1, Xuan Liu1, Guoxiang Hu2
1Department of Chemistry and Biochemistry, Utah State University , Logan, Utah 84322, United States.
Journal of the American Chemical Society
|August 12, 2017
概括
研究人员开发了一种用于过渡金属的新型表面改性,显著提高中性水中的演化反应 (HER). 这种低成本的方法提高了未来能源解决方案的太阳能化转换.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 开发低成本的太阳能到化学转换混合系统对于未来的能源需求至关重要.
- 中性介质中的演化反应 (HER) 往往受到非贵金属转变金属催化剂的动力限制.
- 定制催化剂接口是提高HER催化动力的关键.
研究的目的:
- 制定过渡金属催化剂的一般表面修改策略,以改善中性水中的生成.
- 研究改增强HER性能的机制.
- 通过模仿自然光合作用来实现高效的太阳化转化.
主要方法:
- 易于低温处理各种过渡金属 (Fe,Co,Ni,Cu,Ni-Co合金) 的表面改.
- 物理化学表征包括同步射线吸收光谱 (XAS).
- 密度功能理论 (DFT) 的计算和电化学性能测试.
主要成果:
- 对各种过渡金属成功地进行了表面改,而没有改变它们的散装成分.
- 在pH7下,改性 (N-Ni) 在10 mA cm−2时表现出极低的64 mV的超电位.
- 这种N-Ni催化剂在中性HER中表现出最好的非珍贵电催化剂.
- DFT的计算显示,表面可以促进水的吸附和解离.
结论:
- 表面改是一种高度有效的策略,用于在中性介质中提高非贵金属的HER动力学.
- N-Ni催化剂代表了电催化剂在高效生产方面的重大进步.
- 这种方法为低成本,可持续的太阳能转化为化学能源系统提供了有希望的途径.
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